# UPDATE#

## Synopsis#

UPDATE table_name SET [ ( column = expression [, ... ] ) ] [ WHERE condition ]


## Description#

Update selected columns values in existing rows in a table.

The columns named in the column = expression assignments will be updated for all rows that match the WHERE condition. The values of all column update expressions for a matching row are evaluated before any column value is changed. When the type of the expression and the type of the column differ, the usual implicit CASTs, such as widening numeric fields, are applied to the UPDATE expression values.

## Examples#

Update the status of all purchases that haven’t been assigned a ship date:

UPDATE
purchases
SET
status = 'OVERDUE'
WHERE
ship_date IS NULL;


Update the account manager and account assign date for all customers:

UPDATE
customers
SET
account_manager = 'John Henry',
assign_date = now();


Update the manager to be the name of the employee who matches the manager ID:

UPDATE
new_hires
SET
manager = (
SELECT
e.name
FROM
employees e
WHERE
e.employee_id = new_hires.manager_id
);


## Limitations#

Some connectors have limited or no support for UPDATE. See connector documentation for more details.